/Engine/Plugins/Experimental/MeshModelingToolsetExp/Source/ModelingEditorUI/Public/ModelingWidgets/SDraggableBox.h
When true, the positioning of the box is relative to the bottom of the widget rather than the top, so the VerticalPosition in SetBoxPosition is interpreted as distance from the bottom of the containing widget. The choice here depends on how your widget is generally positioned, for instance if it is near the bottom, you want this to be true so that making the window smaller does not immediately clip your box.
WidgetArgsType & bPositionRelativeToBottom &40; bool InArg &41;